Catamayo Canton is a canton of Loja Province in Ecuador. Its seat is Catamayo. It is located in the north of the province, bordered by the cantons of Loja, Gonzanamá, Olmedo, and Chaguarpamba. In it is located the largest and most fertile valley of the province, and is the location of the Monterrey Sugar Cane Processing Plant, a major sugarcane operation which is a financial boon to the province and country. The town of La Toma in Catamayo is the seat of the city of Loja's airport.